Abstract
Field and laboratory experiments were conducted to assess the response of wheat to external auxin application and nitrogen. Studied factors in the field experiment were different concentrations of auxin (0, 50, and 100 ppm) and nitrogen fertilizer application (0, 75, and 150 kg/ha). In the laboratory experiment, germination traits of produced seeds from maternal plants under the field experiment treatments were assessed. Results showed that no auxin application with nitrogen application had higher stem and leaf yield than auxin application of 50 ppm with nitrogen application of 150 kg/ha. Under high nitrogen application, the negative effect of external auxin on seed yield occurred at a lower concentration. Under nitrogen application of 75 kg/ha, auxin application of 100 ppm reduced harvest index and seed weight. Nitrogen application reduced seed germination percentage but auxin broke the negative effect of nitrogen on seed germination.
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